• Corosync provides reliable communication between nodes, manages cluster membership and determines quorum
• How To Create a High Availability Setup with Corosync, Pacemaker, and Floating IPs on Ubuntu 14.04

nodeN# apt install corosync

nodeN# cat /etc/corosync/corosync.conf

...
                bindnetaddr: 10.5.N.0
...
                mcastaddr: 239.255.1.X
...

nodeN# cat /etc/corosync/corosync.conf

...
quorum {
...
       two_node: 1
...
nodelist {
        node {
                name: node1.corpX.un
                nodeid: 1
                ring0_addr: 10.M.N.100+X
        }
        node {
                name: node2.corpX.un
                nodeid: 2
                ring0_addr: 10.M.N.200+X
        }
}

nodeN# service corosync restart

nodeN# corosync-cmapctl | grep members

nodeN# tail /var/log/syslog